AWI for Gary Bishop.
AWI for Gary Bishop.

Fix long-standing bug in plot3d that Gary spotted.  Only a few lines are
involved in the change.  AWI doesn't follow all of this change except that
the u array was being accessed out of its range for one particular case in
the old version.

svn path=/trunk/; revision=3777

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot